Stone-drill.



,0. E. HALL.

I STONE DRILL. APPLIUATIQN FILED APR. a, 1908.

927,723. Patented July 13, 1909.

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5 a Q: 3 G 60 57 42 JIE JQI I \Q 8 l J wvenip'c 1 Hail. wihwoozo 20 2attozmag CARL E. HALL, OF ATWATER, MINNESOTA.

STONE-DRILL.

Specification of Letters Patent.

Patented July 18, 1909.

Application filed April 8, 1908. Serial No. 425,943.

T 0 all whom it may concern:

Be it known that l, CARL ll. T'TALL, a citizen of the United Ht ates,residing at .\twater, in the county of Kandiyohi and State oflilinnesota, have invented certain new and useful improvements inStone-Drills, of which the t't'illmving is a specification.

This invention relates to drills and more particularly to stone drillsand has for an object to provide a drill especially adapted for use uponfarms and which may be operated manually.

A further object of this invention is to provide a drill with revolublehammers operable against the upper end of an oscillating drill shank.

A further object of this invention is to provide means for adjusting thebed plate of the drill whereby the drill bit may be driven at thedesired angle into the ground.

Other objects and advantages will be apparent from the followingdescription and it will be understood that changes in the soecificstructure shown and described may be made within the scope of the claimswithout departing from the spiritof the invention.

In the drawings forming a portion of this specification, and in whichlike characters of reference indicate similar parts in the severalviews, Figure 1 is a side view of the present drill, Fig. 2 is a topplan view, Fig. 3 is an end view, Fig. 4 is a detail horiyontalsectional view on the line '4 oil Fig. 1, Fig. 5 is a horizontalsectional view on the line 5-5 of F 1, Fig. 6 is a transverse sectionalview on the line 6 6 of Fig. 2, Fig. 7 is a perspective view of the bitholder.

Referring now more particularly to the drawings, there is shown a drill1O comprising a bed plate 11 having transversely extending rods 12 and13 respectively adjacent its ends. Each rod is provided at each side ofthe bed plate with a circular plate 14 having a corrugated outer face15. The ends of the rods outwardly of each plate 14 are provided withsimilar revoluble plates 16 having corrugated inner faces 17 foradjustable coengagement with the corrugations ot the plate 14. The rodsare threaded at their outer ends, and these threaded portions receivethumb nuts 18 for holding the plates engaged with each other.

The plates 16 are provided with socket members 19 arranged to receivelegs 20 pro vided with usual slidablc extensions 20 and having toothededges 21 engaged with pawls 22 carried by the bed plate ll. The legs arethus adjustable vertically and by means of the plates it and 16respectively it is obvious that the bed plate may be adjusted angularlywith relation to the legs.

The bed plate 1.1 is provided with brackets 23 and Q-l: respectively,and journaled in the upper ends oi these brackets there is shown atransversely extending shaft 25 provided at its end outwardly o'l. thebracket 22-) with a gear wheel 26 in mesh with an idler gear 2?, andthis gear 27 is in mesh with a drive gear 28 provided with a crankhandle 25), as shown.

The shaft 25 is provided at its center with a fixed arm 30 provided ateach end with a hammer 31 pivoted to the arm 30 as shown at 32. Stops 33are carried by the arm 30 and are arranged to limit the inward movementof the hammers 31.

The bracket 23 is provided with an outwardly extending arm 34, andlocated at the outer end of this arni there is shown a plate 35 arrangedin parallel relation to one end of the bed plate. The plate 35 isprovided adjacent its outer end with a vertically dis- ]posed passagearranged to receive senilcircular depending portions 37 and 38respcctivcly of bit holding sections 39 and 40 respectively which arehingedly connected as shown at 41. The sections 39 and 40 when closed,form a circular head 42. The sections 39 and 40 respectively areprovided with angular notches 43 which forming a passage receive avertically disposed bit 44. The head 42 of the bit holder is providedwith a peripheral series of ratchet teeth 45, above which there is showna circular groove 46 arranged to receive a spring pressed finger 47,carried by a guide plate 48 secured to the plate 35, serving to preventupward move ment of the bit holder. The section 39 carries a resilienttoothed catch D, detachably engaged with a suitable recess in theopposite section, and arranged to lie flush with the peripheral face ofthe head, as shown in Figs. 4 and 7.

An oscillating band 49 is arranged to encircle the bit holder, and thisband is movable in the guide 48 and in similar guides 49 which are alsocarried by the plate 35. The

band is provided with a spring pressed dog- 50 engaged with the ratchetteeth 46 of the holder. The band is also provided with an outwardlyextending arm 51 which carries at its outer end a plate 52 having aninwardly directed reduced portion 53, and formed upon the outer end ofthis reduced portion there is shown a spherical member 5% which receivesthe socket 55 carried by a reciprocating arm 56. The arm 56 is thusuniversally connected at its lower end and at the upper end, this arm isconnected in a like manner to a crank wheel 57 mounted upon a stub shaft58 carried by the bracket 24. The stub shaft 58 is provided with a gearwheel 59 in mesh with a gear wheel 60 carried by the shaft 25. The bit44 is disposed in a passage formed in the outer end of a plate 61, whichis slidable in guides 62 carried by the bed plate 11. The plate 61 isprovided with a set screw 63 engaged with the upper surface of the bedplate.

It will thus be seen that a simple, efficient and inexpensive drill isprovided which may be conveniently driven by manual power, and by theconnections shown and described it will be seen that during theoscillating movement of the bit the arms 30 will be re volved, carryingtherewith, the hammers 31 which will in turn strike the upper end of thebit and thereby facilitate its movement into the ground.

What is claimed is:

1. A drill of the class described comprising a frame, including a bedplate, circular plates secured to the sides of the bed plate, and havingcorrugated outer faces, transversely disposed rods carried by the bedplate and having their inner ends disposed through the circular plates,plates carried by the rods and having corrugated faces adapted forclamping engagement with the first named corrugated faces, adjustablelegs carried by the last named plates, said plates and legs beingadapted for adjustment of the bed plates at various angles with respectto the perpendicular, while retaining the legs in perpendicularposition, revoluble hammers carried by the frame, a bit holder revolublymounted on the frame, means for operating said hammers, and operativeconnections between said hammers and bit holder.

2. In a drill of the class described, a support having a circularopening therethrough, a collar secured revolubly over said opening, andhaving a laterally extending portion carrying a ball and socket joint,and adapted for connection with a source of power for oscillation of thecollar, a bit holder engaged revolubly and detachably in said collar,said holder comprising opposite hinged sections having angular notchesin their adjacentportions forming a passage adapted to hold a bitslidably therein against relative rotation, said head having peripheralratchet teeth therein and a peripheral groove adjacent to the teeth, andhaving also a spaced top member adapted to secure the opposite sectionsin coengaged position, a finger carried by the collar and disposedslidably in said groove, to retain said head against disengagement fromthe collar, and a spring pressed dog carried by the collar and adaptedfor engagement with said ratchet teeth, for rotation of the head uponoscillation of the collar.

In testimony whereof I affix my signature, in presence of two witnesses.

NELs A. NELSON, OLIVER HALL.

